Cydia

And while the baseband IS updated in this firmware (so if you're yellowsn0w unlocked, DON'T upgrade til a proper PwnageTool version is out), 3.0 is already jailbroken, so say the Dev Team on a recent blog post.

And for those wondering, yes the 3.0 OS is jailbreakable on all devices. It’s just those using 3G yellowsn0w that have to show some restraint and wait for PwnageTool to create a custom IPSW that avoids the baseband update.

We'll let you know ASAP when a version of PwnageTool which works with 3.0 is out, but rest easy knowing the devices are already ready for WinterBoard and all your favorite jailbreak apps right next to Apple's 100 new 3.0 features.